Unknown

Unknown (originally titled Unknown White Male) is 2011 action film directed by Jaume Collet-Serra, based on the novel Out of My Head by Didier van Cauwelaert, starring Liam Neeson, Diane Kruger, January Jones, Aidan Quinn and Frank Langella.
The Plot: Dr. Martin Harris (Liam Neeson) awakens after a car accident in Berlin to discover that his wife (January Jones) suddenly doesn't recognize him and another man (Aidan Quinn) has assumed his identity. Ignored by disbelieving authorities and hunted by mysterious assassins, he finds himself alone, tired, and on the run. Aided by an unlikely ally (Diane Kruger), Martin plunges headlong into a deadly mystery that will force him to question his sanity, his identity, and just how far he is willing to go to uncover the truth.

Resource:Wikipedia